1. ІgnatkinaО., Fedko I., Lysenko N. THE INFLUENCE OF ENALAPRIL MALEAT AND METOPROLOL TREATMENT ON HEMODYNAMICS AND HEART RATE VARIABILITY INDECES AMONG PATIENTS WITH CHRONIC HEART FAILURE IN DIFFERENT AGES GROUP // The Journal of V. N. Karazin Kharkiv National University, series "Medicine". 1. № 6. C. 44-49.